Hakan has the nomenclature correct, the difference in construction has to do with the partical size distribution, and construction methodology.
MDF is made up of different sized particals with a lower and upper size limit, and are bound w/ a formaldehyde glue under modest pressure.
HDF has no lower size limit and is made under higher pressure.
The partical size is very important, if you have a 1 liter jar, and try to fillit w/ 1 liter of rocks, 1 liter of sand and 1liter of beer you can do it(mostly) depending upon the way you do it.
if the rocks go in first then sand, then beer, it works, because the sand fills in the iner-rock spaces, and the beer being a liquid will flow arround it all.
many differently sized particals will allow a denser end material.
try corian also
happy listening
MDF is made up of different sized particals with a lower and upper size limit, and are bound w/ a formaldehyde glue under modest pressure.
HDF has no lower size limit and is made under higher pressure.
The partical size is very important, if you have a 1 liter jar, and try to fillit w/ 1 liter of rocks, 1 liter of sand and 1liter of beer you can do it(mostly) depending upon the way you do it.
if the rocks go in first then sand, then beer, it works, because the sand fills in the iner-rock spaces, and the beer being a liquid will flow arround it all.
many differently sized particals will allow a denser end material.
try corian also
happy listening